[Bug 242201] ipfw - option 'ipversion 6' not working

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242201

--- Comment #2 from Freddy DISSAUX <dsx at bsdsx.fr> ---
The flag is_ipv6 is set by:

...
        /* Identify IP packets and fill up variables. */
        if (pktlen >= sizeof(struct ip6_hdr) &&
            (eh == NULL || eh->ether_type == htons(ETHERTYPE_IPV6)) &&
            ip->ip_v == 6) {
                struct ip6_hdr *ip6 = (struct ip6_hdr *)ip;

                is_ipv6 = 1;
...

Test ip->ip_v seems correct

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